Hydraulic hoist for trucks.



Se Tu HYDRAULIC HOIST FOR TRUCKS.

APPucATloN rlLEp luLY 11.1911.

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IN VENTOR. S. T. Wal/oc@ Patented Apr. 30 19118.

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lBe it known that ll, SAMUnL T. WALLACE,

a citizen of the United States, residing at San Francisco, in the county of San Frant cisco, State of California, have invented a 'new and useful Hydraulic Hoist for rllrucks,

of which'the following is aspecication, in such full and clear terms as will enable those skilled in the art to construct and use the Il@ s'ameA This invention'relates to avhoist for o er- A ating the dumpirfg bodies of automo ile trucks, and its object is to produce a. hoist which -can be installed in almost any posi- 1t tion as may be required by the particular construction of the automobile on which it is to be placed.

Another object of the invention is to produce a self-contained automobile and hoist operating mechanism'which will require no outside piping'for the operation of the hydraulic piston.

Another object of the invention is to produce a hoist which will raise the dumping lbody to a' sucient angle to properly dump the material carried therein, while at the same time the operating mechanism will not roject unduly below the frame of the veicle. 80

as the description proceeds.

An embodiment of the invention is shown in the drawings in which the same reference numeral is applied to the same portion a5 throughout, but 1am aware that there may4 be modifications thereof.

Figure 1 is a side elevation of a portion of the vehicle frame showing the dumping body thereon and illustrating the angle to fwhich it is raised when it is to be dumped,

Fig. 2 is a plan view of the apparatus for dumping the'vehicle body as it appears when assembled upon the fra-me of the truck, the body being removed for the purpose of illustration, v

Fig. 3 'is a side elevation of the hoist c linder, the pumpingapparatus bemg Q etached therefrom, y

Fig. 4 is a cross sectional view of a porttt tion of, the hoist cylinder on the line 4-4 Fi 3 Y Fig.s 5 is across section of a portion of the hoist cylinder on the line 5-5 Fig. 3,

Fig. 6 is a side elevation of the 4pump at operating apparatus and pump chamber,

Other objects of the invention will 'appear Fig. 7 is a horizontal sectional view `of the pump and driving mechanism therefor, and

Fig.` 8 is a vertical sectional View of the valves used for the operation of the pump.

The side members of the truck frame are indicated at 1 and 2, which side members are connected together by lsuitable cross pieces 3, 4 and 5, while other suitable cross pieces 6, 7 and 8 connect the side frames and lserve to support its body hoisting apparatus.

The members 6 and 7 have a suitable yoke at the center to' receive the hydraulic cylinder 9, and said cylinder is held in position on the cross (pieces 64 and '7 by means of two straps 10 an 11 'which pass thereover, and which straps are bolted to the cross pieces 6 and 7 respectively. The cross angle iron 8 is suitably riveted or bolted to the side frames 1 and 2, and it has avbracket 12 at its center which supports the wheel 13 over which the cable 14 passes. The hydraulic cylinder has flanges 15,16, 17 and 18 to insure holding it in the proper position, and its head 19 is provided with a stuliing box 20. A laige pipe l21 rests on the gland 22` of the stu ng box,land at its outer end it is supported by the cross piece 8 so that it forms a guide for the head 23 of the piston rod 24 to whichk the cable 14 is secured, as well as providing means whereby the piston rod will be kept clean. The pump operating mechanism is contained within two small casings' 25, 26 bolted on the sides of the cvlinder 9, and the operation of which will be presently explained.

v The 'pump operating mechanism is operated by means of the shaft 27, which shaft extends into the casing 25 and which `has a sprocket Wheel 28 -loosel `mounted thereon, but which is held in a Xed position longitudinally of the shaft by means of a collar 29. Any suitable shaft extending from the power plant such as 30 withJ; sprocket wheel 31 thereon is made use of forv driving ythe pump to operate the hoist, and a sprocket chain 32 extends around the two sprocket wheels 31 and 28 to drive the latter.

Mounted on the cross piece 30 is a bracket 33 which carries a lever 34, which lever operates a toothed clutch collar 35 in a well known manner,I said Aclutch collar being moved into engagement with the `sprocket wheel 28 to drive the latter whenever the 4ever ..34 l moves it rearwardly, and since llt@ shaft 37 carried by two In front of the supports 38, 39, the truck' body carries two bearing blocks 40 through lwhich bearingblocks, pins 41, 42 pass, one

for each bloc ,y and said pins are pivotaf connected with one en'd o the links 43, EachA link 43, 44 is pivotally Connected at its lower end tothe end of an arm as indicated-at 45, 46, and said arms are carried by and rigidly connected to a shaft 47 extendingI entirely across the vehicle frame, and journaled in boxes 48, 49. The shaft 47 has a grooved segment wheel 50 mounted thereon, to which wheel the cable 14 is connected, So that as the piston'rodis ulled linto the cylinder 9, the wheel 50 will e rotated, the truck body will'be raised to the position shown in dotted lines in Fig.. 1.

The cylinder 9 has two passage ways 51 52 cast therein, one leading to one end of .the cylinder and the other leading to the opposite end of the cylinder. These two passage ways are joined in a boss 53, cast on the side of the cylinder, and which boss is closed by means of a plu 54 through which the stem' 55 of a va ve 56 passes. The valve stem 56 is connected with an L- shaped lever 58 which is pivoted at 59 on the cross piece 6, the object being to enable the operator to; open' the valve 56 against the effort of a spring 59 inside the plug 54 whereby .the pressure in both ends of the cylinder will be equali'zed and the weight.

of the truck body will lcause it to descend.

e pump 'is mounted= in: a casing 26 previous y referred to, which is bolted on the side of the cylinder 9, and it consists of the double end single actin piston 60, said piston havin suitable pac ing rings at 61, 62. The cham er forming the cylinder for the piston is closed by means of the two threaded plugs 63, 64. At the ends of the pump chamber, there are openings thereinto from the passage ways 51, 52, and these passage ways are intercepted by two valves 65 which seat on the holes 65 and by two valves 6 6 within the casing26. Plugs 67,`

68 hold the two valves 65 in their proper place and two plugs 69,' 70 -hold the two valves 66 in thelr proper place, while said Valves are held seated spring 71 surrounding bearing -upon the plug instance.

y means` of a spiral the valve stem and land valve in each Mounted on the side .of the casing 26 is small bevel :gear 75 on a shaft'76 incenso shaft -27 extending therento through a lpacking gland73, and it is provided with a small bevel gear 74 in mesh with a similar angles to the shaft 27. The shaft 76 has an extension76 journaled in the casing 25, and it is also journaled in ablock 77 which is secured within the casin 25 by means of a set screw 7 8. The shaft 76 is provided' with va .crank 79,-the crank pin 80 of which engages a link 81 pivotally connected by means of the pin 82 with the piston 60.

The apparatus is started by themovement of the lever 34 so that the collar 35 will engage the sprocketgear 28, and it is stopped by means of the long rod 81 which carries a stop arm 82 which engages a pin 83 on the lever` 34and pushes the collar 35 out of contact with the s rocket gear 28 when the piston has move .nearly to the len h of its throw. Therad 81 passes over t e top of the cross pieces 4,6 and 7 and engages the piston rod with a right angle bend 84 adjacent the cross piece 8, and the tube 21 is longitudinally slotted to permit the arm 84.

to move with said piston rod.

While the hoist illustrated is shown in the most convenient location, occurs that the hoist cylinder must be installed `in some other position than the one shown, in which event the mounting is such asto give practically a universal setting to the shaft 27 thereby enabling it tobe connected with almost any driving shaft from which the power may be taken.

For example, if the cylinder 9 is installed in an inclined position, the casing 25 may be rotated to a suitable osition around the axisof the shaft 76 untll the shaft 27 will stand in a convenient location, or if it is necessary to turn the cylinder 9,.it may be turned around its own axis and the casing 25 may be then turned as may appear convenient to connectwith the power shaft.

The operation of the apparatus is as follows z-Assuming the truck body to be inthe position shown in Fig. 1 in full lines, ,the operator starts the apparatus by pushin the outer end of the lever 34 backwardly. his will cause the clutch 35 to engage the sprocket wheel 28-and startythe pump. As the pump operates, the liquid within the hoist cylinder, usually oil of some kind, is delivered from the assage way 51 to the rear end of the cylin er, and in that way the piston within the cylinder 9 on the end of the piston rod 24 will be forced forward,

drawing the cable 14 along with it and rotating the segment gear 50. As the segment gear rotates the arms 45, 46 also rotate and y means of the links 43,44 they will raise the vehicle body to the position shown in -dotted lines in Fig. 1.-

When the body has been raised through the stroke of the Piston, the-stop arm at right it frequently 82 will engage the pin 83 causing the clutch 35 to be disengaged and thereby stop the pump, thus leaving the body in theraised position. f

- When the operator desires toV lower the body, he operates the lever 58 to unseat the valve 56 thereby equalizing the pressure in l both ends of the cylinder, whereupon the weight of the body will bring it back to the position shown in full lilies in Fig. 1, and will at the same time transfer the oil from one end of the piston to the other.

Having thus described my invention what l claim as new and desire tosecure by Letters Patent of the United States, is as follows, express reservation being made of permissible modifications. y

1. The combination with a truck frame of a dump body, depending links connected with the body for raising it, a hydraulic cylinder, a piston therein, means operated by the piston and connected with said links for raising the body, atpump on the side of the cylinder for trans errng the liquid used therein from one end to the other of the cylinder, and means to operate the pump secured thereto and capable of being placed in any angular adjustment with respect to an axis at right angles to the axis of the main cylinder.

2. The combination with a truck frame of a dump body, depending links' connected with the body for raising it, a hydraulic cylinder, a piston therein, means operated by the piston and connected with the links for raising the dump body, anda pump on the side of the cylinder for transferring the liquid used therein from one end to the other end thereof, the hydraulic cylinder being adjustable 'around its own axis and the pump 'operating mechanism being adjustable around an axis at right angles to the axis of the-hydraulic cylinder.

3. The combination with a truck frame of therein, means operated by the piston and connected with said links for raising the body, a pump on the side of the cylinder for piston and connected with the links for raising the body, a pump on the side of the cylinder, the latter having passage Ways for the transfer of the fluid used therein from one end to the other end thereof, a pum operating mechanism capable of being adjusted in any angular position with respect to an axis at right angles to the axis of the hydraulic cylinder, an equalizing valve carried by the hydraulic cylinder for equalizing the pressure in both ends of the cylinder, and manual means for operating said equalizing valve.

5. The combination with a truck frame of a dump body thereon, depending links for raising the body, a hydraulic cylinder, a piston therein, means operated by the piston and connected with the links for raising the body, a pump on the side of the hydraulic cylinder, and means to operate said pump to transfer the liquid fromvone end of the cylinder to the other, the hydraulic cylinder beine" ca able of bein T laced in an angu- D D D lar adjustment with respect toits axis, and the pump operating mechanism being capable of being placed in any angular adjustment with respect to an axis at right angles to the axis of Lthe hydraulic cylinder.

In testimony whereof I have hereunto set my hand this 11th day of July, A. D. 1917.

SAMUELT. WALLACE. 

